Abstract: Chlorophyll content (chl), one of the most important physiological parameters related to plant photosynthesis, is usually used to predict plant potential and portable, non-destructive chlorophyll meters could be a valuable and effective tool for estimating Relative Chlorophyll Content (RCC) in leaves. In this study, two species of soluble inorganic Selenium forms, selenite (SeIV) and selenate (SeVI) at different concentrations were investigated on maize plants that were growing in nutrient solutions during 2 weeks and changes of RCC within this time was monitored. It means chlorophyll content of three leaves of maize when everyone grew completely was measured according to Special Products Analysis Division (SPAD) value and the results revealed that high concentrations of SeIV (10, 30 and 90 mg.kg-1) were toxic for maize even lower amounts (1 and 3 mg.kg-1) had effects of damage on it while this state wasn’t adjusted for lower concentrations of SeVI (1 and 3 mg.kg-1) and treated samples didn’t have significant differences with controls although in higher amounts (10 and 30 mg.kg-1) toxic effects were seen in them, too.